#pragma once

#include <iostream>
#include <string>
#include <cstring>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <cstdlib>

using namespace std;

class sock
{
public:
    static int Socket()
    {
        int sock=socket(AF_INET,SOCK_STREAM,0);
        if(sock<0)
        {
            cerr<<"socket error"<<endl;
            exit(2);
        }
        return sock;
    }

    static void Bind(int sock,uint16_t port)
    {
        struct sockaddr_in local;
        memset(&local,0,sizeof(local));
        local.sin_family=AF_INET;
        local.sin_port=htons(port);
        local.sin_addr.s_addr=INADDR_ANY;

        if(bind(sock,(struct sockaddr*)&local,sizeof(local))==0)
        {
            cerr<<"bind error!"<<endl;
            exit(3);
        }
    }

    static void Listen(int sock)
    {
        if(listen(sock,5)<0)
        {
            cerr<<"listen error"<<endl;
            exit(4);
        }
    }

    static int Accept(int sock)
    {
        struct sockaddr_in peer;
        socklen_t len=sizeof(peer);
        int fd=accept(sock,(struct sockaddr*)&peer,&len);
        if(fd>=0)
        {
            return fd;
        }
        return -1;
    }
};